Scaffold appliance



Aug, 24 mass. 1 597,095

'- M. H. MARTINSEN SCAEFOLD APPLIANCE Filed Sept. 8, 1924 INVENTQR Mir/112 Mir/1125812 may. 1."

- A TORNEY Patented Aug. v24, 1926.

UNITED STATES I MARTIN H. MABTINSEN, OF SEATTLE, WASHINGTON.

SGAII'OLD APPLIANCE.

Application filed September 8, 1924. Serial No. 736,571.-

My invention has particular reference to improvements in supports of the detachable variety for upholding platforms of scuf folds used in building operatlons. Its primary object is the provision in a scaffold of a transversely extending support which can be conveniently and detac ably connected with a vertically extending section of the framework, and afford, in connection wlth another support, or a plurality of them, of identical construction and likewise secured in place, horizontally disposed supporting elements for a platform of a scaffold.

Other objects will appear as the descr1ption of my invention progresses.

In the accompanying drawmg Figure 1 is a view of the device complete, illustrating its use in three dlfierent positions. First, as a support ng element for a platform of a scaffold, disposed between a side of a building and a vertically extending section of the scaffold; second, as a supporting element for a shelf on the outer framework of the scaffold, for holding building material; and, third, as a support for block and tackle designed to be utlllzed in hoisting said material to the shelf.

Fig. 2, an elevation of said device, one end being shown as secured to a sectlon of a scaffold and the body indicated by broken sections.

Fig. 3, across-section drawn on the line 33 of Fig. 2, particularly showing in detail one terminal of the device designated the wall plate, and through which the same is secured to a buildin i Fig. 4, a top view 0 the device, with the body in broken sections, showing one end secured to a cross-sectional portion of a scaffold and indicating the means for fastening the other end to a wall.

Fig. 5, a view particularly dlrected to the elements of the device by which the same is detachably secured to a scaffold, the parts, which include a. pivoted dog and a. flared portion gripping a section of timber, being shown in positions the reverse of that indicated in Fig. 2.

Referring more particularly to the drawing, 1.des1gnates the bod of the device, which, in the present em odiment of the invention, consists of a section of channel iron of a length suitable for maintaining a platform in a scaffold. The means for detachably securing the support in place at one end, comprise a member having a platelike terminal 2, a flared portion generally designated as 3 and forming a gripping member, and a recessed section 4 located between said terminal and portion. Said terminal is bolted to the body through the openings 5. A flat, elongated dog or gripping member 6, having an ear 7, and terminating at its lower end in a curved edge section or claw 8, is pivotally mounted in said recess, through said ear, and the bolt and nut denote 9. ,10 designates an ordinary 2 X 4 timber utilized as part of a scaffold, and 11 a series of openings in the terminal and the body to provide an adjustment for said member, the purpose of which will be presently described.

The portion 3 is disposed at an oblique angle relative to the body and is provided at its free end with a bight portion having a diagonal edge 12, adapted-to em race an edge of said timber. in Figs. 2 and 5 an end of the body is cut away diagonally, thus producing in connection with the portion 3 a flared section As it will be noted- 13, which permits said dog to have a backward play as indicated by dotted lines in Fig. 5. In applying the member just described to said timber, the device is raised at an oblique angle and the dog swung backwardly to the limit indicated at 13, when the body of the dog and the edge 12 of the bight portion will define an opening, having parallel side portions, which will easilyadmit the timber within the member, then when thebody of the device is brought into a horizontal position, as shown, said dog comes into intimate contact with the timber, its body practically flush with and its curved end being forced into one edge of the timber, and the bight portion forced to snugly embrace the other edge of the timber, as indicated in Figs. 2 and 5. Ob-

viously, the more pressure applied to the now horizontally disposed body, the greater the grip of said elements "on the timber. The center of the outer wall of the bight portion is offset so that it is slightly above the center of the beam, thus providing a binding action as the beam comes to the horizontal position.

To detach the member from the timber, an u ward pull on the body will disengage the 0g from the timber and force it backwardly to its limit; it will also release the bight portion therefrom, and permit the member to be withdrawn through said openin formed.

lhe device as illustrated 1s ad usted to fit a 2 x 4 timber. The openings 11 in the member and complementary openings in the body of the device, also designated b the same number, are provided whereby t 1e member, cooperating with the dog as mentioned, may be adjusted to fit a 2 x 6 timber, by moving the member to and likewise securing the same in said last-named openings. And, in the same manner, the device can be made to accommodate timbers of other widths, if desired.

The means at the other end of the body for securingthe' device in place, comprise, in the embodiment shown, a cast T plate riveted to the body, as indicated in Fig. 3, to provide a rectangular wall plate 20 having a pair of vertically extendlng slots 21, each terminating at its lower end in an enlarged opening. The end of the device ust described is designed to be secured to a wall by nailing, a nail being driven through each of the enlarged openings into the Wall, and the plate then forced downwardly until each nail becomes flush with the upper end of its slot, thus securely holding the plate against lateral displacement. The nails obviously are so placed. as to insure a horizontal position for the body when it is disposed in operative position. Each of said openings serves a double purpose in that it is a guide to the Workman in placing the nail to bedriven, and permits the plate to be disengaged from the wall without removing either of the nails. The pull exerted on the body for removing the member, as heretofore described, will also serve to disconnect the wall plate from the nails.

In Fig.1, 30 denotes the wall of a building, 31, one of the devices complete, secured,

supporting the platform. 34 indicates block and tackle sup-ported by the device, for the purpose of hoisting said material.

The use of this support does away with the excessive mutilation of the material incident to the ordinary use of nails in constructing a scaffold, but four nails being required to mount a pair of the devices for maintaining a platform therein. By the manipulations described, it can be quickly applied, removed, or adjusted to any desired position. Its removal or adjustment can be effected without the necessity of tearing down or rebuilding the scaffold proper. It is thus instrumental in producing a saving in material and labor, with a consequent reduction in cost.

In the preferred form of the device, I contemplate the use of a body of channel iron and castings of suitable material, of a' form and secured together as described and shown, however, I may provide other arrangements and constructions for carrying out the invention without departing from its spirit or scope, as defined by the appended claims.

I claim 1. In a scaffold appliance, a beam, a gripping member at one end of the beam having said gripping member being slightly above the plane of the said beam, and a dog formed by a fiat plate with a sharp edge curved slightly inward at one end, pivotally an aperture in one side, the outer end of mounted at one side of the said gripping member, said dog presenting a comparatively long adjustable flat surface to frictionally engage an object that may be placed within thesaid gripping member.

2. In a support for scaffolding or the like, i

a beam, a plate attached to one side of the said beam, and extending beyondthe end of the said beam in a slightly upwardly inclined position, the outer end of the said plate extending around to substantially conform to a U, and another plate with a point extending laterally at one end, pivotally attached to the end of the beam in such a manner that it is substantially perpendicular to it.

MARTIN H. MARTINSEN. 

